Hardware system for genlocking
US6441812B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/46
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A computer system includes a graphics controller with a first refresh rate and a first horizontal synchronization signal; a secondary source of video data having a second refresh rate and a second horizontal synchronization signal; and a genlock unit for reconciling the first refresh rate of the graphics controller with the second refresh rate of the secondary source. The genlock unit outputs a clock signal with a frequency modulated to reconcile the first refresh rate and the second refresh rate by monitoring the phase differences of the first horizontal synchronization signal and the second horizontal synchronization signal in response to a first control signal and outputs a clock signal at a frequency corresponding to a selected clock frequency in response to a second control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.